JPS5836668Y2 - Easy-open can lid - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lid for a simple opening can, so-called a pull-tab can, and its purpose is to facilitate painting and repairing of the back side of a portion of the score when manufacturing the lid. This also prevents damage to the paint on the back of a portion of the score during storage and transportation of the lid.

As shown in FIGS. 1 and 2, the lid of a conventional simple-open can, the lid of a so-called easy-open can, is pulled up so that it is easy to put a finger on the pull tab (pulling piece) 20. A pull tab 20 with a finger hook 21 lifted upward from the flat plate part 11 of the lid body is attached to the flat plate part 11 of the lid body with the chain part 12.
Attach to.

The opening piece 30 that is removed by the pull tab 20 is
It is divided by providing an annular score (cut line) 15 on the back surface of the flat plate part 11 of the lid, which is separated from the arcuate score portion 17 and the linear outer score 16,16'.

The back side of the lid is internally coated to prevent corrosion, as it comes into direct contact with the food and drinks filled and stored in the can.

When the above-mentioned annular score 15 processing is applied to this lid body, the painted part of the coating on the back of the lid body at the position corresponding to the back side of the score may crack or peel partially due to the impact during the scoring process. receive damage.

Such damage to the coating on the back surface of the lid causes corrosion and pitting of the lid, resulting in contamination of the food and drinks filled and stored.

Therefore, after applying the annular score 15, paint was sprayed on the back surface of the score to repair the back surface.

By the way, the annular score 15 engraved on the flat plate part 11 of the lid body
is annular surrounding the aperture piece 30 as shown in FIG.
will be applied.

When the annular score 15 is applied, plastic deformation flow of the metal occurs in that area, so that the opening piece 30 surrounded by the annular score 15 moves toward the upper side of the lid, as shown in FIG. A bulge 31 is produced, and as shown in FIG. 4, the annular score 15 and the more divided opening piece 30 are curved upward.
A curved surface 32 appears inside the position corresponding to the back surface of the score.

Conventionally, for cases in which the curved surface 32 appeared on the inside at a position corresponding to the outer score 16.16' on the back surface, the back surface was repaired by spray painting as described above.

This repair of the back side painting was done by turning the lid upside down, so the paint sprayed for repair would flow down along the curved surface 32 as shown in Figure 4, making it impossible to apply uniform coating. In order to sufficiently apply the coating to the position corresponding to the back surface of the annular score 15, particularly to the positions 16 and 16' on both outer sides, it required a large amount of paint and a long time, which is the conventional situation.

Even if the backside of the score has been painted, when storing and transporting the lids with the curved surface 32 inside at the position corresponding to the backside of the score, it is necessary to stack them as shown in FIG.
In the past, the tip 25 of the upwardly raised pull tab finger hook 21 came into contact with the curved surface 32, damaging the coating on the back surface of that area and causing a risk of corrosion.

Therefore, the present invention eliminates the drawbacks of the conventional methods as described below.

As shown in FIG. 6, the lid of the simple opening can according to the present invention is
In the lid body 10b, an opening piece 30 defined by an annular score 15 on the flat plate portion 11 of the lid body 10b is opened with a pull tab 20, and the widest part of the opening piece 30 is located at the center of the lid body. Between the opposing outer scores 16 and 16', at a position away from the center of the lid at a distance approximately equal to the distance from the finger hook to the tip 25,
The score back surface correction recessed part 25 has a large inner diameter so that the outer edge 36 is close to both outer scores 16.16', and the lower surface thereof protrudes below the lid back surface 33 of both outer scores 16.16'. It is a structure formed in a state.

That is, by the conventional method described above, the outer score is 16.1.
6', after applying the annular score 15 including the arcuate score 17, as shown in FIG.
6' is sandwiched between the upper and lower molds 41 and 42, and then the score 15
The bulging part 31 (see FIG. 3) that was generated when forming the opening piece 30 was pressed downward with the press die 43, and the score of the opening piece 30 was 16.16.
A concave portion 35 with a large inner diameter and a flat lower surface is formed at the outer edge 36.

In this way, the bulging portion 31 generated when forming the annular score 15 is pressed downward with the press die 43 to make the lower surface of the concave portion 35 flat, and the back surface 33 of the lid body of both outer scores 16 and 16' The following phenomenon occurs on the back surface of the lid by forming it in a state that protrudes further downward than the lid.

That is, as shown in FIG. 3, when the annular score 15 is carved, an upward bulge 31 is generated in the opening piece 30 due to plastic deformation flow, and along with this, both outer scores 16.1
6' A curved surface 32 as shown in FIG. 4 is located inside at a position corresponding to the back surface.
It is formed.

This curved surface 32 reversely presses the bulging portion 31 downward to form a concave portion 35 (see FIG. 8) and flattens and disappears, resulting in both outer sides having scores of 16.16' as shown in FIG.
The inner side 33 at the position corresponding to the back surface is corrected to be almost coplanar with the outer side 34.

As described above, the distance between the opposing outer scores 16 and 16' at the widest part of the opening piece 30 defined by the annular score 15, and the distance from the center of the lid body from the tip 25 of the pull tab. By forming a recessed part 35 for score back correction with a relatively large inner diameter at a position approximately equal to the distance to the center of the lid body, and making the inside and outside of the score corresponding position on the back of the opening piece the same plane, as shown in FIG. Similarly, the lid 10b according to the present invention, in which the inner portion 33 at the position corresponding to the back surface of both outer scores 16 and 16' is made almost flush with the outer portion 34, is suitable for repairing the painting of the back surface of the annular score 15. When spraying with the body turned over, the inner part 33 at the position corresponding to the back side of both outer scores 16.16' is also on the same plane as the outer part 34 and does not form a curved surface, so the sprayed paint flows sideways. without any
It has the great advantage of being able to perform painting repairs uniformly and in a short time using a relatively small amount of paint.

The lid according to the present invention has the widest part of the opening section defined by the annular score 15 of the flat plate part, and the distance from the center of the lid body to the tip 2 of the finger hook part of the pull tab 20.
At a position approximately equal to the distance from 5 to the center of the lid body, a concave portion 35 with a flat lower surface and a large inner diameter is formed so that the outer edges 36 are close to the opposing outer scores 16 and 16'. Since it has a structure that is formed to protrude downward from the back surface of the lid body with a score of 16.16' on both sides,
When storing and transporting such lids by stacking them, as shown in FIGS. 10 and 11, the upper lid 10b' of the upper stack is positioned above the lower lid 10b of the lower stack, and the lower lid The upper surface of the pull tab finger hook 21 of 10b comes into contact with the lower surface of the dish-shaped concave portion 35 of the upper lid 10b'.

Even in this case, since the lower surface of the recessed portion 35 is not a curved surface but a flat surface, the coating on the lower surface of the recessed portion 35 is not easily damaged.

As described above, the lid according to the present invention has a concave portion 35 having a large inner diameter and whose outer edge 36 is close to the outer score 16.16', and the lower surface of the recess is connected to the outer score 1
6. Since it is in a state of protruding downward from the back surface at the position corresponding to 16', the pull tab of the bottom stacked lower lid easily comes into contact with the lower surface of the concave part 35 of the top stacked upper lid, and thus the lower lid The pull tab is on the upper level.The outer score of the lid is 16.16.
'Prevent contact with the back surface of the corresponding position.

In the lid body according to the present invention, the back paint repair applied to the back side of the score is not damaged.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the conventional simple opening lid, Fig. 2 is a sectional view of the conventional simple opening lid, and Fig. 3 is the state at the time of score formation.
Fig. 4 is an enlarged view of the score forming part, Fig. 5 is a contact state when conventional lids are stacked, Fig. 6 is a sectional view of the lid according to the present invention, and Fig. 8 is a partially enlarged view during pressing. , FIG. 9 is a partially enlarged view of a score in the formation of a recess, FIG. 10 is a state in which the lids are stacked, and FIG. 11 is an enlarged view of the contact portion of the stacked lids according to the present invention. 10-lid body, 11-lid flat plate part, 12-chain part, 15-annular score, 16 two outer scores, 17-arc-shaped score, 20=pull tab, 21-pull tab finger grip part, 26-
Finger hook tip, 30 - opening piece, 31 = bulge, 32 - curved surface, 33 = score - inner position corresponding to the back side, 34 - score - outer position corresponding to the back side, 35 - concave part, 41. = Upper mold, 4
2=lower mold, 43=pressing mold.

Claims (1)

[Scope of utility model registration request] In a lid body in which an opening piece defined by an annular score on a flat plate portion of the lid body is opened by a pull tab provided on the upper surface of the flat plate portion, an outer score 16.16′ forming the annular score and an arcuate score At the widest part of the divided opening piece, between the opposing outer scores 16 and 16', and approximately equal to the distance between the center of the lid and the tip of the finger hook of the pull tab attached to the lid. Score 16.16 at a position away from the center of the lid body by the distance
'A recessed part 35 for back surface correction is formed, and the outer edge 36 of the recessed part 35 has a relatively large inner diameter close to both outer scores and has a flat lower surface. 16', so that when the lids are stacked, the upper surface of the pull tab 20 of the lower lid comes into contact with the lower surface of the recessed part 35 of the upper lid. Score on both sides of upper lid: 16.16'
It has a structure in which the back surface does not come into contact with the pull tab of the lower lid, and in the inner part 33 and outer part 34 that sandwich the back surface of the opening piece at positions corresponding to both outer scores 16 and 16', the plane of the inner part is set to the outer part. A lid for a simple opening can characterized by a structure that is flush with the plane of the can.